why do i drool so much when i sleep

Drooling during sleep happens because of relaxed facial muscles, sleeping positions, or underlying health conditions. When sleeping on the side or stomach, gravity causes saliva to pool in the mouth and escape more easily. Also, if nasal congestion from allergies, infections, or conditions like GERD or sleep apnea causes mouth breathing, this increases drooling. Excess saliva production or impaired swallowing can also contribute to drooling while sleeping. Overall, drooling is normal, but excessive drooling can indicate health concerns that might need attention.